Boeing and United Airlines have announced an agreement at the 2017 Paris Air Show to convert 100 of its current 737 MAX orders into 737 MAX 10s, becoming the largest single 737 MAX 10 customer in the world.

After announcing orders for 30 incremental Airbus A321ceo aircraft just last month, Atlanta, Georgia-based Delta Air Lines has placed an order for ten more of the aircraft. The agreement was announced today at the Paris Air Show.

Viva Air has signed a memorandum of understanding with Airbus for 50 A320 Family aircraft, comprising 35 A320neo and 15 A320ceo. The agreement paves the way for the group’s airlines VivaColombia and Viva Air Peru to base its fleet renewal and network growth on the A320 Family.

Boeing and SpiceJet have signed a memorandum of understanding for 40 737 MAX airplanes. The agreement, valued at $4.7 billion at current list prices, is split evenly between 20 new orders for the 737 MAX 10 and conversions of 20 of the low-cost carrier’s 737 MAX 8 airplanes from its existing order to 737 MAX 10s.